<!DOCTYPE html>
<html>

<head>
    <title></title>
    <style>

    </style>
    <script src="../../dist/vue.js"></script>
</head>

<body>
    <div id="demo">
        <h1>初始化</h1>
        <p>{{foo2}}</p>
    </div>
    <script>
        debugger
        const app = new Vue({
            el: '#demo',
            data: {
                undefined: "foo",
                foo2: {
                    "foo21": "foo21"
                }
            }
        })
        debugger
    </script>

</body>

</html>






</html>

</html>